R&B singer Toni Braxton has been forced to cancel another four shows as she battles a mystery illness, reports Contactmusic.

A spokesperson for singer Toni Braxton announced she has been hospitalized in Las Vegas. TMZ.com reports that Toni is suffering from pericarditis - an inflammation of the sac surrounding the heart. According to TMZ, Braxton may have contracted the illness when she gave birth to her second son.

A wardrobe and costume designer is suing Toni Braxton, alleging she wrote him a bad check and owes him $15,000 for work on a Las Vegas show.